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List of letters used in mathematics and science : ウィキペディア英語版 | List of letters used in mathematics and science :''This list is about the meanings of the letters used in mathematics and science. SI units are indicated in parentheses. For the Unicode block, see Mathematical Alphanumeric Symbols.'' Some common conventions: * Intensive quantities in physics are usually denoted with minuscules, while extensive are denoted with capital letters. * Most symbols are written in italics. * Vectors can be denoted in boldface. * Sets of numbers are typically bold or "blackboard bold". ==Latin== A — Ampere, area, a blood type, a spectral type, vector potential, Work, set of algebraic numbers B — B meson, a blood type, boron, luminance, magnetic field, a spectral type C — carbon, degrees Celsius, set of complex numbers, coulomb, molar heat capacity, the C programming language, specific heat capacity, Cunningham correction factor D — deuterium, differential operator, electric displacement, D meson, density E — electric field, energy, SI prefix ''exa–'', expected value F — degrees Fahrenheit, farad, fluorine, force, Helmholtz free energy, a spectral type G — Einstein tensor, SI prefix ''giga–'', Gibbs free energy, gravitational constant, Green's function, Momentum, a Spectral type H — auxiliary magnetic field, enthalpy, Hamiltonian, Hankel function, Heaviside step function, Henry, Higgs boson, homology group, Hubble constant, hydrogen, set of quaternions, hat matrix I — iodine, impulse, luminous intensity, moment of inertia, current J — angular momentum, Bessel function of the first kind, current, joule K — kaon, kelvin, potassium, sectional curvature, a spectral type L — angular momentum, inductance (Henries), Lagrangian, litre, a spectral type M — magnetization, mass, SI prefix ''mega–'', a spectral type, torque N — Avogadro's number, Bessel function of the second kind, set of natural numbers, newton, nitrogen, normal distribution, normal vector O — big O notation, a blood type, oxygen, a spectral type P — Legendre polynomial, luminous flux, phosphorus, polarization, power, pressure, probability, projection Q — electric charge, quantity of heat, set of rational numbers, flow rate R — curvature tensor, electrical resistance, radius, set of real numbers S — area, entropy, siemens, sphere, spin operator, sulfur, symmetric group T — a spectral type, temperature, tesla, tritium U — potential energy, uranium, unitary operator V — potential energy, vanadium, volt, voltage, volume W — energy, Lambert's W function, tungsten, watt, W boson, Work, work function, Wiener process X — random variable, abscissa Y — Bessel function of the second kind, SI prefix ''yotta–'', yttrium, ordinate, luminance Z — atomic number, impedance, set of integers, partition function (statistical mechanics), partition function (quantum field theory), Z boson, SI prefix ''zetta–'', altitude ---- a — SI prefix ''atto–'', acceleration, reflectance b — Bottom quark c — SI prefix Charm quark, speed of light, speed of sound d — SI prefix ''deci–'', distance, Down quark, infinitesimal increment, differential operator, density e — Napier's constant, electron, positron, electric charge f — SI prefix ''femto–'', frequency g — gram, gravitational acceleration, gravitational field, distance metric of spacetime h — height, hour, Planck's constant, spherical Hankel function i — imaginary complex unit, imaginary quaternion unit, unit vector, current, row index j — electric current and current density, radiant intensity, spherical Bessel function of the first kind, unit vector, column index, imaginary complex unit, imaginary quaternion unit k — Boltzmann constant, imaginary quaternion unit, SI prefix ''kilo–'', wave vector, unit vector l — length, litre, mean free path m — magnitude, mass, SI prefix ''milli–'', metre, minute n — SI prefix ''nano–'', neutron, refractive index, spherical Bessel function of the second kind o — small o notation p — electric dipole moment, momentum, SI prefix ''pico-'', proton, point of a space, sound pressure q — electric charge, generalized coordinate r — position (vector), radial polar coordinate, radius s — second, Strange quark t — period, time, Top quark u — Up quark v — velocity (m/s) w — velocity (m/s) x — abscissa, real-valued argument, variable to be determined, vector, y — ordinate, SI prefix ''yocto-'', pixel row index z — complex variable, altitude, SI prefix ''zepto-''
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